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A simple light sensor can be built using a photoresistor and Arduino UNO board. This design requires only a few additional components like 10k resistor and a 10k potentiometer to adjust the light intensity level to trigger the circuit. Photo…

The topic of this post is building sine wave generator based on Arduino UNO and PCF8591 8-bit A/D and D/A converter. For similar design with PIC micro-controller look at this link. PCF8591 is a single-chip low-power 8-bit CMOS data acquisition device…

Controlling LED brightness with Arduino is one of the basic circuits you can built.Fade sketch is even included in the basic examples in Arduino IDE. However on Arduino boards it’s done by pulse width modulation, changing the duty cycle of…

Adding a serial data transfer capability to a 7-Segment LED Display can be done by using PCF8574 I/O Port expander with I2C interface. Arduino UNO controls the PCF8574 by sending display codes for each segment. Similar circuit based on PIC16F876…

In this post I’ll show you how to build a RFID reader for security access based on Arduino MEGA board. The code I’ve used is a modified version of a design that was published at Arduino project hub. I added…

In this post I’m going to show you how to use a Serial I2C Interface Module to control 2×16 LCD display with Arduino. For similar design using PIC16F876 click this link. Instead of using 8 or 4 bit parallel connection…

Here is another digital clock design based on Arduino. This time it uses 4-Digit LED Dot Matrix module to show the time. Similar design with LCD display is available here. The Dot Matrix module consists of four MAX7219 chips connected…

In this article I’m going to show you how an 8×8 LED Dot Matrix Display can be driven by MAX7219 with Arduino. Similar design based on PIC16F876 MCU is available at this link. For this project I’ve created my own…

Basic frequency counter capable of measuring 0-5V square wave up to 100kHz can be built using just 2 components: Arduino MEGA board and 2×16 LCD display. For PIC16F876 version click here. Frequency counter code is also very simple. It uses…

Basic Stepper Motor Controller can be built with Arduino board and few additional components like MOSFET switches and a potentiometer to control unipolar stepper motor speed and direction. The principle of operation is relatively simple. When a potentiometer is in…